Milling Cutters for Precision Machining

Cutting tools typically used in milling machines or machining centres are known as Milling cutters, and come in a wide variety of shapes, sizes, and materials which are required in the various operations performed by milling machines.

High speed steel (HSS)  milling cutters wear out faster than Cobalt or Carbide Tools, and are lower in price, They must be run at a lower speed than Cobalt and Carbide tools, so it may be more eonomical to go with the higher priced materials.

What tool to be  used in milling machines is determined by desired shape and on material being machined. Materials have different physical properties and have different density and hardness which require different tool bits to properly machine the materials. The tooling or the the machine itself as well as the material being worked on can be damaged by using improper tooling.

What types of tooling is available and how are they used?

• End mills have cutters on one end and sides and are used in Vertical Mills such as the Bridgeport.
• Slot Drills aare designed to drill straight down and are used for keyways.
• Roughing end mills for fast removal of large amounts of material.
• Ball nose cutters for machining contoured shapes.
• Slab mills are used to machine large broad surfaces.
• Side-and-face cutter is designed to cut on one side without deflecting the cutter.
• Involute gear cutter is made to cut gear teeth.
• Hob is a type of form tool used to generate gears.
• A face mill is designed to hold multiple disposable carbide or ceramic tips which can be replaced when dull.
• A fly cutter will take broad, shallow facing cuts.
• Woodruff cutters are used to cut the keyways used for woodruff keys.
• Hollow milling cutters have theeir cutting teeth on inside and used as a alternative to turning.
• Hollow milling cutters
• A dovetail cutter is an endmill formed to leave behind a dovetail slot.
• T-Slot Miller is designed to leave behind a T-shaped slot.

Some things to consider about milling cutters

• Larger tools can remove material faster than small ones.
• More flutes allows a higher feed rate.
• High helix angles are  best for soft metals.
• Low helix angles work better for hard or tough metals.
• The more teeth a milling cutter has, the more rapidly it can remove material.
• Finishing cutters have a higher rake angle  and give a better finish.
• A single-point cutting tool is used to make a very light cut to achieve precise tolerances.
• The right tool coatings will increase cutting speed and tool life, and improve surface finish.
• Swarf removal is affected by  depth and angle of the flutes, size and shape of the chips, the coolant flow, and the surrounding material.



• Conventional milling (up-milling)is light at the beginning and the tool slides across the surface of the material before it begins to cut, hardening the material and dulling the tool.
• Climb milling engages the material at a definite point, and the chips are disposed behind the cutter providing longer tool life.



• Climb milling should not be attempted on older machines that are not in good condition.
• Milling machine cutters can be used over again with proper sharpening.

The milling machine is a very versatile machine and with the proper milling machine tools is one of the basic tools required in the operation of a machine shop.

Milling Cutter News

Best Milling Cutters

There are various features of a milling cutter which enhance its usage. The flutes of the milling bit are the deep helical grooves running up the cutter, while the sharp blade along the edge of the flute is known as the tooth. …

Publish Date: 08/09/2010 2:09

http://gearhobs.podbean.com/2010/08/09/best-milling-cutters/

Increase Productivity in Gear Milling Operations with Carbide Tools

In 2010 and 2011 new products from Sandvik Coromant will include disc milling cutters and hob milling cutters, which will bring the benefits of advanced carbide inserts to an operation traditionally dominated by conventional HSS tools. …

Publish Date: 06/23/2010 7:00

http://www.myyellowcoat.com/smart-ideas/wind-gear-milling/

Aluminum milling cutters

Machine aluminum faster with Onsrud’s new line of Aluminum Milling Cutters. Our specialized cutting geometry allows for chatter free cuts at high RPM’s and heavy cuts resulting in maximum metal removal rates. Onsrud offers the industries la

Bridgeport milling machine, making a fly cutter

Cutting the slot in the fly cutter to hold the tool. 4 flute .290 diameter endmill at maybe 1000 rpm.

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